Thirteen MS-13 gang members were charged Thursday for more than a half dozen murders, including the 2016 slayings of three Brentwood teenagers, authorities said. The brutal murders of 15-year-old Nisa Mickens and 16-year-old Kayla Cuevas last September sent shockwaves across the community and prompted pledges from law enforcement that the killers would be brought to justice. Five months later, they were, authorities said.